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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Kernel 4.7.x does nor initialize external DisplayPort in Dell E7250 making it unusable"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97397">97397</a>
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<th>Summary</th>
<td>Kernel 4.7.x does nor initialize external DisplayPort in Dell E7250 making it unusable
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>major
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>ed@yen.ipipan.waw.pl
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=125882" name="attach_125882" title="dmesg output">attachment 125882</a> <a href="attachment.cgi?id=125882&action=edit" title="dmesg output">[details]</a></span>
dmesg output
$ uname -a
Linux laptok 4.7.1-1 #1 SMP Wed Aug 17 19:12:42 CEST 2016 x86_64
Intel(R)_Core(TM)<a href="mailto:_i5-5300U_CPU_@_2.30GHz">_i5-5300U_CPU_@_2.30GHz</a> PLD Linux
Machine: Dell Latitude E7250
Kernel 4.7.x does not initialize the external DisplayPort in my laptop. During
start it throws in the logs:
[drm:intel_dp_start_link_train [i915]] *ERROR* failed to train DP, aborting
(full log in the attached dmesg output) and does not allow me to use the
external display connected to this output. It does not matter, it the external
screen is connected at boot time or not - it is not visible in the system.
Everything works fine with kernel 4.6.4 - I can connect external display on the
fly (I use DP-to-VGA converter for I usually use this port for presentations
for my students).
The internal eDP screen works fine and without any problems with both 4.6.x and
4.7.x kernels.
This behaviour is 100% reproducible on my hardware.</pre>
</div>
</p>
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